Compliance Report for MARS/FTLL to the License Review Guide (KINS/GE-N005)

The loss-of-coolant accidents of the HANARO fuel test loop have been predicted by MARS/FTLL computer code. The MARS/FTLL is a modified version of MARS 3.0 computer code. A user input option to use the multipliers of heat transfer correlations has been added to the MARS/FTLL. The multipliers were determined from the uncertainties of the heat transfer correlations so that the peak cladding temperatures of fuels are predicted conservatively in case of the loss-of-coolant accidents. The MARS/FTLL is essentially equivalent to the MARS except the user option on the multipliers of heat transfer correlations. The basic field equations, constitutive relations, and thermal hydraulic models of the MARS/FTLL are exactly the same as those of the MARS. It was ensured that the user option on the multipliers did work properly. All of the thermal hydraulic transient phenomena to be supposed in the loss-of-coolant accidents of the fuel test loop are also covered in assessment problems of the MARS. Therefore the MARS/FTLL can be used for the loss-of coolant accident analyses of the fuel test loop